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When communicating with the Message Broker, the Python Cartridge Agent (PCA) will go through the provided URL list and connect to the first broker that is available.

The listening subscriber client always ensures to maintain a connection with one of the brokers. If the The PCA periodically checks if the connected Message Broker is in fact alive or not. If the connected broker goes down, the PCA will go through the message broker Message Broker list and select the first available broker. If none of the provided message brokers are online, the subscribing client will keep retrying until one broker becomes available. This logic is separately executed for each topic subscription.

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